Claude Time Travel Game Evolves from Prompt to Full Deployed System

A developer on r/ClaudeAI shared their experience evolving a time travel game prompt into a complex, persistent system over approximately 40 days. What started as a simple RPG-style prompt within Claude transformed through iterative development driven by practical needs.

Evolution Timeline

The user began with a prompt about being a time traveler and surviving/thriving, describing it as immersive. After initial enjoyment, they continued playing the same game for about 40 days.

Technical Progression

• Initial Setup: The game became a Project in Claude on Desktop
• State Management: Added YAML file saving to maintain state between conversations, allowing context clearing while preserving memory
• Character System: Implemented memory for other characters and interactions
• Event System: Added events, triggers, and NPC background events
• Cross-Platform: Added mobile play capability alongside desktop
• Scale Management: With 50+ NPCs, events, and interactions, implemented YAML file indexes and lazy loading
• Final Architecture: Around Day 30, deployed as a full game on Fly with a database, background code, and a custom MCP server for accessing game tools and data across desktop and mobile

The user notes they're still playing the same game started approximately 40 days ago, highlighting how Claude enabled this organic evolution from simple prompt to complex system.